510 L. Richardson — Inferior-Oolite Fossils from Doulting. 



neighbourhood and matrices has enabled me to indicate with little 

 possibility of error both approximate horizons and localities ; but in 

 studying the following lists it must be remembered that they are only 

 approximations. Where the evidence was insufficient for more precise 

 stratigraphical allocation the subdivision-columns are left blank and 

 the more-embracing name of " Doulting Beds" entered in the column 

 headed "Remarks." 



Considerable accuracy may be claimed for the lists of fossils given. 

 Mr. S. S. Buckman, F.G.S., identified the Ammonites; Mr. "W. H. 

 Hudleston, F.E..S., most of the Gasteropods ; Mr. W. D. Lang the 

 Corals and Bryozoa ; and Mr. E. T. Paris the Echinoids. 



To the north-east of Doulting the Inferior Oolite is in many places 

 in actual contact with the Palaeozoic rocks of the Mendip Hills. But 

 traced away from those hills Liassic beds are seen to come in below 

 them, and there is very soon the normal formational sequence of, 

 Inferior Oolite, Upper, Middle, and Lower Lias, with the Rhaetic and 

 Keuper below. 



The Marlstone or rock-bed of the Middle Lias is very well exposed 

 in an abandoned quarry on Mays (or probably more correctly " Maes ") 

 Down, a mile and a half to the south of Doulting. Above are seen 

 the basement-beds of the Upper Lias — clays and thin limestone-bands — 

 which are also exposed on the slope of Small Down, below the 

 "ancient entrenchment." Deposits oi falciferi and lifrontis hemerce 

 are in evidence ; then comes clay. How thick this clay is it is 

 difficult to say, but there appear to be "Sands" also present in the 

 hillsides. In the railway-cutting at Doulting Bridge a clay -bed comes 

 immediately below the Inferior Oolite. Probably it overlies some 

 sand, and — if it could be traced further east— might be seen to be 

 succeeded by sand. Its date, however, is difficult to determine, but 

 it is probably either striatuli or Struckmanni} 



Above the Upper Lias exposed in the railway-cutting comes the 

 Inferior Oolite. In this neighbourhood it is divisible as follows : — 



Approximate 

 Subdivisions. thicknesses 



in feet. 



1i. — Rubbly-Beds ; Tercbratula globata , auctt., «o« \ 



So werby, common, etc 8 [=Chjpeus- 

 ii. — Anabacia-ljimesiones ... ... ... 8^ I Grit. 



^ iii. — Doulting Stone ; massive Freestone ... 44 / 



[Upper Coral-Bed and Dundry Freestone wanting.] 



( = Upper 

 vi. — "Conglomerate-Bed" [Upper Triffonia -Grif]. 1| { Trigonia- 



[ Grit. 



There can be no doubt that the Conglomerate-Bed finds its equivalent 

 in the similarly-designated deposit at Maes Knoll, Dundry Hill, near 

 Bristol, where there is evidence that it is succeeded by the Dundry 



' At first I thought the clay-bed might come below the Striaiiihim-'Bed, making it 

 ■pTe-striatiili, but then an alternative explanation suggested itself, which was 

 graphically represented on p. 392 of my main paper. Unfortunately, however, the 

 statement of the earlier view (lines 15-17 from bottom of p. 391) escaped the 

 necessary qualification. 



